64965921 has 24 divisors (see below), whose sum is σ = 92171520. Its totient is φ = 40695264.

The previous prime is 64965871. The next prime is 64965931. The reversal of 64965921 is 12956946.

It is a happy number.

It is not a de Polignac number, because 64965921 - 2¹⁰ = 64964897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64965931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241375 + ... + 241643.

It is an arithmetic number, because the mean of its divisors is an integer number (3840480).

Almost surely, 2^64965921 is an apocalyptic number.

It is an amenable number.

64965921 is a deficient number, since it is larger than the sum of its proper divisors (27205599).

64965921 is a wasteful number, since it uses less digits than its factorization.

64965921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 514 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 64965921 is about 8060.1439813443. The cubic root of 64965921 is about 402.0022957221.

The spelling of 64965921 in words is "sixty-four million, nine hundred sixty-five thousand, nine hundred twenty-one".